The **CSTCE12M2G55A-R0** is a specific type of electronic component known as a **Ceramic Resonator**. It is manufactured by **Murata Manufacturing Co., Ltd.** and belongs to the CERALOCK® family. Below is a detailed breakdown of its specifications and electronic characteristics. --- ### 1. Fundamental Component Details This part is a surface-mount device (SMD) used primarily to generate a clock signal for microcontrollers (MCUs) and other digital ICs. Unlike simple quartz crystals, this part features **built-in load capacitors**, simplifying the circuit design. | Parameter | Specification | | :--- | :--- | | **Nominal Frequency** | 12.000 MHz | | **Frequency Tolerance** | ±0.5% | | **Operating Temperature** | -40°C to +125°C | | **Load Capacitance** | 33 pF (Internal) | | **Mounting Type** | Surface Mount (SMD) | | **Package Size** | 3.2 x 1.3 mm | --- ### 2. Electronic Characteristics & Function The CSTCE series functions based on the piezoelectric effect of ceramics. Here are the key electronic aspects: * **Internal Structure:** It consists of a piezoelectric ceramic substrate with three terminals: 1. Input 2. Ground (Middle pin) 3. Output * **Built-in Capacitance:** The "G55" in the part number indicates it includes two internal load capacitors (typically 33pF). This eliminates the need for external capacitors on the PCB, saving space and reducing BOM (Bill of Materials) costs. * **Frequency Stability:** While less precise than a quartz crystal, it is significantly more stable and accurate than an internal RC oscillator. It is ideal for applications where extremely tight timing (like high-speed USB) isn't mandatory, but reliable clocking is. --- ### 3. Part Number Decoder Understanding the "CSTCE12M2G55A-R0" nomenclature: | Code Segment | Meaning | | :--- | :--- | | **CSTCE** | Product Series (SMD type with built-in capacitors) | | **12M2** | Nominal Frequency (12.2 MHz or 12.0 MHz contextually) | | **G** | Frequency Tolerance (G = ±0.5%) | | **55** | Load Capacitance Code (55 = 33pF) | | **A** | Individual Specification | | **-R0** | Packaging (R0 = Plastic Taping, 3000pcs/reel) | --- ### 4. Typical Application Circuit When connecting this to a Microcontroller (MCU), the middle pin must be connected to the digital ground. ```c MCU ___________ | | | OSC_IN |----[ Pin 1: Input ] | | | | GND |----[ Pin 2: Ground ] | | | | OSC_OUT |----[ Pin 3: Output ] |___________| ``` ---